How do you identify a load cell wire?
To determine your load cell wiring color codes consult the load cell installation manual, look on the load cell cable for a color code marker, look at the load cell certificates, and diagrams for the color code listing, or see the attached Tech Note for additional information.
What is the excitation voltage of a load cell?
Typical sensitivity values are 1 to 3 mV/V. Typical maximum excitation voltage is around 15 volts.
What is the rated output of a load cell?
A loadcell output is rated in millivolts per volt (mV/V) of the difference voltage at full rated mechanical load. So a 2 mV/V loadpin will provide 6 millivolt signal at full load when excited with 3v. Typical sensitivity values are 1 to 3 mV/V; most SP load cell are rated around 1.5mV/V.
What is the difference between 4 wire and 6 wire load cells?
Each wire has a name, both 4 wire and 6 wire load cells have +input, -input, +signal and –signal wires. A 6 wire load cell will also have a +sense and a –sense wire which are sometimes referred to as +reference and –reference.
How many wires are in a load cell?
Depending on the model, the load cells may have a cable with 4 or 6 wires plus the screen. The 6-wire models, in addition to having the terminals of power supply + and power supply – and signal + and signal -, have 2 additional wires called Sense + and Sense – which may also be denominated reference.
How do you check load cell voltage?
Set the multimeter in DC millivolts and connect the output wires of the load cell to the multimeter. Supply a voltage of 5V or 9V DC at the excitation leads and place a test weight on the load cell. The multimeter will register a change in voltage measured across the load cell’s output.
What does 2 mV v mean?
A sensitivity of 2 mV/V means that a force transducer produces an output signal of 2 mV at nominal (rated) force, when supplied with one volt. With 5 V excitation voltage, the corresponding output voltage will be 10 mV.
How is a load cell calibrated?
The load cells calibration procedure involves incremental loading and the evaluation at each step of the output signals of both the calibrated weighbridge and of the master load cell (Figure 8-4). The number of divisions used and the method of applying the force (hydraulic or servomotor) is up to the user.